Steel structure assembled fan foundation and construction method

Abstract

The application discloses a steel structure assembly type fan foundation and a construction method thereof in the technical field of fan foundations, and comprises a fan-shaped foundation component, a circumferential connecting plate and an anchor bolt assembly. A plurality of fan-shaped foundation components are uniformly distributed along a circumferential direction. The circumferential connecting plate is fixedly connected between two adjacent fan-shaped foundation components. The two adjacent fan-shaped foundation components are fixedly connected along the circumferential direction through fasteners. The anchor bolt assembly is arranged in the inner cavity of the fan-shaped foundation component, the bottom end of the anchor bolt assembly is fixedly connected with the fan-shaped foundation component, and the top end of the anchor bolt assembly extends to above the fan-shaped foundation component along an axial direction. The application has the advantages of simple construction process, convenient installation, avoidance of the influence of environmental factors on construction, saving of fan construction time, saving of construction cost, and guaranteed construction quality.

Description

Technical Field

[0001] This invention relates to the field of wind turbine foundation technology, specifically to a steel structure prefabricated wind turbine foundation and its construction method. Background Technology

[0002] Currently, China is facing an energy transition, aiming to build a clean, low-carbon, safe, and efficient new energy system. Among various clean energy sources, wind power has become the fastest-growing new energy source in recent years. Wind energy is inexhaustible, has minimal environmental impact, and its development can greatly alleviate the environmental pollution pressure caused by traditional energy sources. With the increasing maturity of wind turbine technology, the growth of wind power generation has been very rapid, making it the most suitable new energy source for planning and development.

[0003] The wind turbine foundation is an important component of the wind turbine structure, and its construction directly affects the economic efficiency of the entire wind turbine. Currently, most wind turbine foundations are constructed by binding steel bars and pouring concrete on site. This construction is greatly affected by site environmental conditions, resulting in long construction periods, difficulty in ensuring construction quality, and limitations on construction in winter.

[0004] Therefore, how to reduce the impact of environmental conditions on wind turbine foundation construction and improve the construction efficiency and quality of wind turbine foundations has become a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a steel structure prefabricated wind turbine foundation to address the above-mentioned technical problems, so as to reduce the impact of environmental conditions on wind turbine foundation construction and improve the construction efficiency and quality of wind turbine foundation.

[0006] The technical solution adopted in this invention is: a steel structure prefabricated wind turbine foundation, comprising: a fan-shaped foundation component, a circumferential connecting plate, and an anchor bolt assembly;

[0007] The plurality of the aforementioned sector-shaped basic components are evenly distributed along the circumferential direction;

[0008] The fan-shaped foundation component includes a foundation base plate, a connecting wing plate, a radial rib plate, and a foundation column. The foundation column is fixedly connected to the upper part of the inner end of the foundation base plate, the connecting wing plate is fixedly connected to the upper part of the outer end of the foundation base plate, the radial rib plate is fixedly connected to the upper part of the foundation base plate, the inner end of the radial rib plate is fixedly connected to the foundation column, and the outer end of the radial rib plate is fixedly connected to the connecting wing plate.

[0009] The circumferential connecting plate is fixedly connected between the connecting wing plates of two adjacent sector-shaped base components;

[0010] Two adjacent foundation columns are fixedly connected along the circumferential direction by fasteners.

[0011] The anchor bolt assembly is inserted into the inner cavity of the foundation column. The bottom end of the anchor bolt assembly is fixedly connected to the foundation column, and the top end of the anchor bolt assembly extends axially to the top of the foundation column.

[0012] Preferably, the foundation column includes radial side plates, end plates, a top plate, and a horizontal web plate. The two radial side plates are fixedly connected to the top of the foundation base plate in the radial direction. The end plate is fixedly connected to the outer ends of the two radial side plates. The horizontal web plate is fixedly connected between the two radial side plates. The top plate is fixedly connected between the top ends of the two radial side plates.

[0013] A lower through hole is provided on the horizontal web, and an upper through hole is provided on the top plate to mate with the lower through hole. The anchor bolt assembly includes an anchor rod, an upper limit nut, a lower limit nut, and a fastening nut. The anchor rod passes through the upper and lower through holes. The upper limit nut is located above the horizontal web and is threaded onto the anchor rod. The lower limit nut is located below the horizontal web and is threaded onto the anchor rod. The fastening nut is threaded onto the top of the anchor rod and is used to fix the wind turbine tower to the foundation column.

[0014] Preferably, the radial side plate has multiple circumferential connecting holes, and the fasteners include high-strength bolts, washers, and connecting nuts. One end of the high-strength bolt passes through the circumferential connecting holes of two adjacent foundation columns, the washer is sleeved on the high-strength bolt, and the connecting nut is threadedly connected to the high-strength bolt.

[0015] Preferably, each of the fan-shaped foundation components includes two radial ribs, and a circumferential web is fixedly connected between the two radial ribs, and the plurality of circumferential webs are spaced apart in the radial direction.

[0016] Preferably, the two connecting wing plates are installed one-to-one on opposite sides of the two radial ribs, and the connecting wing plates are provided with interconnected circumferential slots and radial through holes. One end of the circumferential connecting plate is inserted into the circumferential slot, and the circumferential connecting plate is provided with connecting holes corresponding to the radial through holes, and connecting bolts are installed in the radial through holes.

[0017] Preferably, the circumferential connecting plate is a V-shaped plate.

[0018] Preferably, the fan-shaped foundation component is a prefabricated steel structure component.

[0019] The second objective of this invention is to provide a construction method for a steel structure prefabricated wind turbine foundation, the construction method comprising the following steps:

[0020] S1: Prefabricate the aforementioned sector-shaped foundation components and circumferential connecting plates;

[0021] S2: Excavate the foundation pit and pour the foundation pad for the wind turbine;

[0022] S3: Place fan-shaped foundation components along the circumferential direction on the fan foundation pad layer;

[0023] S4: The foundation columns of two adjacent sector-shaped foundation components are connected by the fasteners;

[0024] S5: The connecting wing plates of two adjacent sector-shaped base components are fixedly connected by connecting bolts and circumferential connecting plates;

[0025] S6: Install anchor bolt assemblies on the sector-shaped foundation component;

[0026] S7: Place ballast blocks on the fan-shaped foundation components, backfill the surface with soil and compact it;

[0027] S8: Install the wind turbine tower.

[0028] The beneficial effects of this invention are:

[0029] This invention adopts a prefabricated structure, which can connect multiple circumferentially distributed fan-shaped foundation components to form a wind turbine foundation through circumferential connectors and fasteners. Each fan-shaped foundation component is a prefabricated component, which not only has the advantages of simple construction procedures and convenient installation, but also avoids the impact of environmental factors on construction, saves wind turbine construction time, saves construction costs, and ensures construction quality. Attached Figure Description

[0030] Figure 1 This is a structural schematic diagram of the steel structure prefabricated wind turbine foundation of the present invention;

[0031] Figure 2 A first-view three-dimensional schematic diagram of the fan-shaped foundation component;

[0032] Figure 3 A second-view three-dimensional schematic diagram of the fan-shaped foundation component;

[0033] Figure 4 This is a schematic diagram of the circumferential connecting plate.

[0034] Figure 5 This is a structural schematic diagram of the anchor bolt assembly;

[0035] Figure 6 This is a schematic diagram of the fastener's structure;

[0036] Figure 7 This is a schematic diagram showing the connection between two adjacent sector-shaped foundation components.

[0037] Explanation of the reference numerals in the figure:

[0038] 100. Sector-shaped foundation components;

[0039] 110. Foundation slab;

[0040] 120. Connecting wing plate; 121. Circumferential slot; 122. Radial through hole;

[0041] 130. Radial ribs;

[0042] 140. Foundation column; 141. Radial side plate; 142. End plate; 143. Top plate; 144. Horizontal web plate; 145. Lower through hole; 146. Upper through hole; 147. Circumferential connection hole;

[0043] 150. Circumferential web;

[0044] 200. Circumferential connecting plate; 210. Connecting hole;

[0045] 300. Anchor bolt assembly; 310. Anchor bolt; 320. Upper limit nut; 330. Lower limit nut; 340. Fastening nut; 350. Washer;

[0046] 400. Fasteners; 410. High-strength bolts; 420. Washers; 430. Connecting nuts;

[0047] 500. Connecting bolts. Detailed Implementation

[0048] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. These embodiments are for illustrative purposes only and are not intended to limit the scope of the invention.

[0049] In the description of this invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0050] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0051] Furthermore, in the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0052] Examples, such as Figures 1-7 As shown, a steel structure prefabricated wind turbine foundation includes: a fan-shaped foundation component 100, a circumferential connecting plate 200, and an anchor bolt assembly 300.

[0053] There are multiple fan-shaped base components 100, and these multiple fan-shaped base components 100 are evenly distributed along the circumferential direction.

[0054] Each sector-shaped foundation component 100 includes a foundation base plate 110, a connecting wing plate 120, a radial rib plate 130, and a foundation column 140. The foundation base plate 110 is horizontally arranged, the foundation column 140 is fixedly connected to the upper part of the inner end of the foundation base plate 110, the connecting wing plate 120 is fixedly connected to the upper part of the outer end of the foundation base plate 110, and the radial rib plate 130 is fixedly connected to the upper part of the foundation base plate 110. The inner end of the radial rib plate 130 is fixedly connected to the foundation column 140, and the outer end of the radial rib plate 130 is fixedly connected to the connecting wing plate 120.

[0055] There are multiple circumferential connecting plates 200, and each circumferential connecting plate 200 is fixedly connected between the connecting wing plates 120 of two adjacent fan-shaped base components 100, so that multiple fan-shaped base components 100 are connected as one unit in the circumferential direction.

[0056] The foundation columns 140 of two adjacent fan-shaped foundation components 100 are fixedly connected along the circumferential direction by fasteners 400.

[0057] There are multiple anchor bolt assemblies 300, and the anchor bolt assemblies 300 are inserted into the inner cavity of the foundation column 140. The bottom end of the anchor bolt assembly 300 is fixedly connected to the foundation column 140, and the top end of the anchor bolt assembly 300 extends axially to the top of the foundation column 140.

[0058] This invention adopts a prefabricated structure, which can connect multiple circumferentially distributed fan-shaped foundation components 100 into a wind turbine foundation through circumferential connecting plates 200 and fasteners 400. Each fan-shaped foundation component 100 is a prefabricated component, which not only has the advantages of simple construction procedures and convenient installation, but also avoids the impact of environmental factors on construction, saves wind turbine construction time, saves construction costs, and ensures construction quality.

[0059] Specific embodiment 1, such as Figures 1-7 As shown, a steel structure prefabricated wind turbine foundation includes: a fan-shaped foundation component 100, a circumferential connecting plate 200, an anchor bolt assembly 300, and fasteners 400.

[0060] The fan-shaped foundation component 100 is a prefabricated steel structure component, and there are multiple fan-shaped foundation components 100, such as 16, which are evenly distributed along the circumference.

[0061] Each sector-shaped foundation component 100 includes a foundation base plate 110, a connecting wing plate 120, a radial rib plate 130, and a foundation column 140. The foundation base plate 110 is generally sector-shaped and is arranged horizontally. The foundation column 140 is fixedly connected to the upper part of the inner end of the foundation base plate 110, that is, the foundation column 140 is fixedly installed above the foundation base plate 110, and in the radial direction, the foundation column 140 is located at the end of the foundation base plate 110 closest to the center. The connecting wing plate 120 is fixedly connected to the upper part of the outer end of the foundation base plate 110, that is, the connecting wing plate 120 is fixedly installed above the foundation base plate 110, and in the radial direction, the connecting wing plate 120 is located at the end of the foundation base plate 110 furthest from the center. The radial rib 130 is fixedly connected to the top of the foundation plate 110, and the radial rib 130 is arranged in the radial direction. The inner end of the radial rib 130 is fixedly connected to the foundation column 140, and the outer end of the radial rib 130 is fixedly connected to the connecting wing plate 120.

[0062] Specifically, the foundation column 140 includes radial side plates 141, end plates 142, a top plate 143, and a horizontal web plate 144. There are two radial side plates 141, which are fixedly connected radially above the foundation base plate 110. The end plates 142 are fixedly connected to the outer ends of the two radial side plates 141. The horizontal web plate 144 is fixedly connected between the two radial side plates 141, and the top plate 143 is fixedly connected between the top ends of the two radial side plates 141, making the foundation column 140 fan-shaped with an open inner end. A lower through hole 145 is provided on the horizontal web plate 144, and an upper through hole 146 is provided on the top plate 143 to mate with the lower through hole 145; that is, the upper through hole 146 and the lower through hole 145 are coaxially arranged.

[0063] There are multiple anchor bolt assemblies 300, and multiple anchor bolt assemblies 300 are installed on each foundation column 140. The anchor bolt assembly 300 is installed in the inner cavity of the foundation column 140, and the bottom end of the anchor bolt assembly 300 is fixedly connected to the foundation column 140. The top end of the anchor bolt assembly 300 extends axially to the top of the foundation column 140 to fix the flange at the bottom of the wind turbine tower to the foundation column 140.

[0064] Specifically, each anchor bolt assembly 300 includes an anchor bolt 310, an upper limit nut 320, a lower limit nut 330, and a fastening nut 340. The anchor bolt 310 passes through the upper through hole 146 and the lower through hole 145 from top to bottom. The upper limit nut 320 is located above the horizontal web 144 and is threaded onto the anchor bolt 310. The lower limit nut 330 is located below the horizontal web 144 and is threaded onto the anchor bolt 310. The fastening nut 340 is threaded onto the top of the anchor bolt 310, and a washer 350 is also fitted on the anchor bolt 310 for fixing the wind turbine tower to the foundation column 140.

[0065] In the circumferential direction, two adjacent foundation columns 140 are fixedly connected by multiple fasteners 400.

[0066] Specifically, each radial side plate 141 is provided with a plurality of circumferential connecting holes 147; the fastener 400 includes a high-strength bolt 410, a washer 420 and a connecting nut 430. One end of the high-strength bolt 410 passes through the circumferential connecting holes 147 of two adjacent foundation columns 140. The washer 420 is sleeved on the high-strength bolt 410. The connecting nut 430 is threadedly connected to the high-strength bolt 410.

[0067] It should be noted that after multiple fan-shaped foundation components 100 are fixedly connected along the circumference to form a wind turbine foundation, an operating cavity with a top opening is formed in the middle of the wind turbine foundation. This operating cavity is connected to the opening of the foundation column 140 to facilitate the operation of workers.

[0068] Each sector-shaped foundation component 100 includes two radial ribs 130, which are fixedly installed on the foundation base plate 110 in the radial direction. A circumferential web 150 is fixedly connected between the two radial ribs 130. That is, the circumferential web 150 is arranged in the circumferential direction, and one end of the circumferential web 150 is fixedly connected to one radial rib 130, and the other end of the circumferential web 150 is fixedly connected to the other radial rib 130.

[0069] The circumferential web 150 has multiple vertical sections, and the multiple circumferential webs 150 are spaced apart in the radial direction. In the radial direction, from the foundation column 140 to the connecting wing plate 120, the vertical height of the two radial ribs 130 gradually decreases, and the height of the multiple circumferential webs 150 also gradually decreases, so as to form a cavity for accommodating backfill soil on the foundation column 140.

[0070] There are two connecting wing plates 120, and the two connecting wing plates 120 are installed one-to-one on the opposite side of the two radial ribs 130. The connecting wing plates 120 are provided with interconnected circumferential slots 121 and radial through holes 122. That is, the connecting wing plates 120 are provided with circumferential slots 121 along the circumferential direction and radial through holes 122 along the radial direction. The radial through holes 122 are connected to the circumferential slots 121.

[0071] One end of the circumferential connecting plate 200 is inserted into the circumferential slot 121 of a foundation column 140, and the other end of the circumferential connecting plate 200 is inserted into the circumferential slot 121 of another foundation column 140. The circumferential connecting plate 200 is provided with a connecting hole 210 corresponding to the radial through hole 122. That is, the connecting hole 210 and the radial through hole 122 are coaxially arranged, and a connecting bolt 500 is installed in the radial through hole 122. The connecting bolt 500 is a high-strength bolt to fix the circumferential connecting plate 200 to the connecting wing plate 120.

[0072] Preferably, the circumferential connecting plate 200 is a V-shaped plate.

[0073] An example is a construction method for a steel structure prefabricated wind turbine foundation, which includes the following steps:

[0074] S1: Prefabricate the fan-shaped foundation component 100 and the circumferential connecting plate 200 in the factory.

[0075] S2: Excavate the foundation pit and pour the foundation layer for the wind turbine.

[0076] S3: Place the fan-shaped foundation component 100 along the circumferential direction on the wind turbine foundation pad layer.

[0077] S4: Connect the foundation columns 140 of two adjacent sector-shaped foundation components 100 with fasteners 400.

[0078] S5: The connecting wing plates 120 of two adjacent sector-shaped base components 100 are fixedly connected by connecting bolts 500 and circumferential connecting plates 200.

[0079] S6: Install anchor bolt assembly 300 on sector-shaped foundation component 100.

[0080] S7: Place ballast blocks on the fan-shaped foundation component 100, backfill the surface with soil and compact it.

[0081] S8: Install the wind turbine tower.

[0082] Compared with the prior art, this application has at least the following beneficial technical effects:

[0083] (1) The wind turbine foundation components, connecting plates, high-strength bolts and anchors of the present invention can be prefabricated in a standardized batch in the factory, effectively controlling the cost of wind turbine foundations.

[0084] (2) The steel structure prefabricated wind turbine foundation of the present invention has a simple construction process and is easy to install. It does not require wet connection, which can effectively save the construction time of onshore wind turbines, save construction costs, and ensure construction quality.

[0085] (3) The steel structure prefabricated wind turbine foundation of the present invention can be installed and constructed in extremely cold regions, avoiding problems such as difficulty in curing and construction of wind turbine foundation concrete in low temperature environment, and the construction is less affected by extreme weather such as rain, strong wind, and blizzard.

[0086] (4) The circumferential web of the wind turbine foundation components can effectively improve the stress performance of the steel structure and prevent local buckling deformation of the steel structure.

[0087] (5) The arrangement of the connecting wing plates and circumferential connecting plates of the wind turbine foundation components can effectively increase the integrity of the wind turbine foundation structure and improve the overall seismic performance of the steel structure prefabricated wind turbine foundation.

[0088] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present invention, and these improvements and substitutions should also be considered within the scope of protection of the present invention.

Claims

1. A steel structure prefabricated wind turbine foundation, characterized in that, include: Fan-shaped foundation component (100), circumferential connecting plate (200) and anchor bolt assembly (300); The plurality of said sector-shaped base components (100) are evenly distributed along the circumferential direction; The fan-shaped foundation component (100) includes a foundation base plate (110), a connecting wing plate (120), a radial rib plate (130), and a foundation column (140). The foundation column (140) is fixedly connected to the upper part of the inner end of the foundation base plate (110). The connecting wing plate (120) is fixedly connected to the upper part of the outer end of the foundation base plate (110). The radial rib plate (130) is fixedly connected to the upper part of the foundation base plate (110). The inner end of the radial rib plate (130) is fixedly connected to the foundation column (140), and the outer end of the radial rib plate (130) is fixedly connected to the connecting wing plate (120). The circumferential connecting plate (200) is fixedly connected between the connecting wing plates (120) of two adjacent sector-shaped base components (100); Two adjacent foundation columns (140) are fixedly connected in the circumferential direction by fasteners (400); The anchor bolt assembly (300) is inserted into the cavity of the foundation column (140). The bottom end of the anchor bolt assembly (300) is fixedly connected to the foundation column (140), and the top end of the anchor bolt assembly (300) extends axially to the top of the foundation column (140). The foundation column (140) includes radial side plates (141), end plates (142), top plates (143) and horizontal web plates (144). The two radial side plates (141) are fixedly connected to the foundation base plate (110) in the radial direction. The end plates (142) are fixedly connected to the outer ends of the two radial side plates (141). The horizontal web plates (144) are fixedly connected between the two radial side plates (141). The top plate (143) is fixedly connected between the top ends of the two radial side plates (141). The horizontal web (144) is provided with a lower through hole (145), and the top plate (143) is provided with an upper through hole (146) that cooperates with the lower through hole (145). The anchor bolt assembly (300) includes an anchor rod (310), an upper limit nut (320), a lower limit nut (330), and a fastening nut (340). The anchor rod (310) is inserted into the upper through hole (146) and the lower through hole (145). The upper limit nut (320) is located above the horizontal web (144) and is threaded onto the anchor rod (310). The lower limit nut (330) is located below the horizontal web (144) and is threaded onto the anchor rod (310). The fastening nut (340) is threaded onto the top of the anchor rod (310) and is used to fix the wind turbine tower to the foundation column (140). The radial side plate (141) has multiple circumferential connecting holes (147). The fastener (400) includes a high-strength bolt (410), a washer (420), and a connecting nut (430). One end of the high-strength bolt (410) passes through the circumferential connecting holes (147) of two adjacent foundation columns (140). The washer (420) is sleeved on the high-strength bolt (410). The connecting nut (430) is threadedly connected to the high-strength bolt (410). Each of the aforementioned sector-shaped foundation components (100) includes two radial ribs (130), and a circumferential web (150) is fixedly connected between the two radial ribs (130), and the plurality of circumferential webs (150) are arranged at intervals along the radial direction. Two connecting wing plates (120) are installed one-to-one on opposite sides of two radial ribs (130), and the connecting wing plates (120) are provided with interconnected circumferential slots (121) and radial through holes (122). The circumferential connecting plate (200) is a V-shaped plate, and one end of the circumferential connecting plate (200) is inserted into the circumferential slot (121). The circumferential connecting plate (200) is provided with connecting holes (210) corresponding to the radial through holes (122), and connecting bolts (500) are installed in the radial through holes (122).

2. The steel structure prefabricated wind turbine foundation according to claim 1, characterized in that, The fan-shaped foundation component (100) is a prefabricated steel structure component.

3. A construction method for a steel structure prefabricated wind turbine foundation according to claim 1 or 2, characterized in that, The construction method includes the following steps: S1: Prefabricate the fan-shaped base component (100) and the circumferential connecting plate (200); S2: Excavate the foundation pit and pour the foundation pad for the wind turbine; S3: Place a fan-shaped foundation component (100) on the circumferential direction on the wind turbine foundation pad layer. S4: The foundation columns (140) of two adjacent sector-shaped foundation components (100) are connected by the fasteners (400). S5: The connecting wing plates (120) of two adjacent sector-shaped base components (100) are fixedly connected by connecting bolts (500) and circumferential connecting plates (200); S6: Install anchor bolt assembly (300) on the sector-shaped base component (100); S7: Place ballast blocks on the fan-shaped foundation component (100), backfill the surface with soil and compact it; S8: Install the wind turbine tower.

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